Not quite. pyPlc talks the DIN protocol which is meant only for charging. Quite a few cars will also allow discharging during a charge session but the MEB cars do not allow this.
To make it possible we'd have to marry pyPlc to ISO 15118-20. With that MEB cars allow 10 MWh of discharging. So ...

I'm wondering if I can use this to use my new Cupra Tavascan as a Home battery together with my Sungrow SH10RT hybrid inverter?